Finding the Fourth Proportional to 1,487.12, 2,229.60 and 716.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,487.12 : 2,229.60 = 716.72 : x
2. Step 2: Convert to fraction form
   1,487.12/2,229.60 = 716.72/x
3. Step 3: Cross multiply
   1,487.12x = 2,229.60 × 716.72
4. Step 4: Simplify right side
   1,487.12x = 1,597,998.91
5. Step 5: Solve for x
   x = 1,597,998.91/1,487.12
6. Step 6: Final answer
   x = 1,074.56